> Quick answer: Google Shopping descriptions can run up to 5,000 characters, but 500–1,000 is the sweet spot. Search ad descriptions (RSAs) cap at 90 characters each, with up to 4 per ad. Lead with the most important product details, include relevant keywords, and skip promotional text entirely.
Product descriptions in Google Ads do two jobs at once. They help Google decide which searches trigger your ad. They help customers decide whether to click.
Get them right and your ads reach the right people at the right moment.
What is a Product Description in Google Ads?
Definition and role in search ads vs. shopping ads
In Shopping ads, descriptions live inside your product feed. Most customers never see them directly. But Google reads every word to match your product to relevant search queries. In Responsive Search Ads (RSAs), descriptions are visible copy that appear below your headlines. Customers read them before clicking.
How Google uses descriptions for relevance and ranking
Google scans Shopping descriptions alongside titles and other feed attributes. The more specific your description, the better Google can match your product to searches. Per Think with Google guidance on ad creative and relevance, including product benefits, features, and relevant keywords directly influences which queries trigger your ad.
Key Differences. Google Shopping Descriptions vs. Search Ad Descriptions
Shopping feed descriptions. 500–1,000 characters recommended
Shopping descriptions allow up to 5,000 characters. Google recommends 500–1,000 for best results. Focus on specific product details that help both the algorithm and the customer make a decision.
Search ad descriptions. 90 characters per field (up to 4 descriptions)
RSA descriptions max out at 90 characters each. You can write up to 4. Google tests combinations automatically and surfaces the best-performing pairs. Every space counts toward the character limit.
How each impacts visibility and conversion
Research shows 90% of people viewing Shopping ads never read the description in the feed. But descriptions still drive ranking. For search ads, descriptions are fully visible and directly influence CTR.
Best Practices for Writing Product Descriptions
Start with the most important details (first 160–500 characters)
Google and shoppers scan the opening lines first. Put your best product specifics up front. Size, material, use case. Don't save the key details for the end.
Focus on customer pain points and buying considerations
Think about what a customer needs to know before buying. What questions do they ask? Answer them in the description. Be direct and specific.
Include SKU details without promotional language
List specifics. size, material, pattern, age range, texture, color. Skip "10% off" or "free shipping." Google prohibits promotional language in Shopping descriptions outright.
Write professionally and grammatically correct copy
Typos and clunky sentences reduce trust. Write clean, confident copy. Read it aloud before publishing. If it sounds wrong, fix it.
Avoid comparisons, business info, and external links
Don't mention competitors. Don't include your company name or website address in the description field. Google's Merchant Center policy explicitly forbids both.
Character Limits and Technical Requirements
Shopping ads. up to 5,000 characters, but aim for 500–1,000
5,000 characters is the hard ceiling. Descriptions beyond 1,000 characters rarely add ranking value. Keep it tight and specific.
Search ads. 90 characters per description (spaces count)
Ninety characters goes fast when spaces count. Make every word earn its place.
What not to include. promos, company names, timestamps, competitor comparisons
Google prohibits promotional text, business information, timestamps, unnecessary capitalization, and product comparisons. Violating these rules can get your feed flagged or suspended.
How to Write Descriptions That Drive Results
Identify target keywords customers actually search for
Use the terms your customers type, not internal product codes. "Women's waterproof hiking boots size 8" beats "SKU-4892-BLK." Think like a buyer, not a warehouse manager.
Highlight benefits, features, and unique selling points
What makes this product worth buying. Lead with that. Be specific. "Reinforced toe cap for trail durability" outperforms "high quality" every time.
Include a clear call-to-action in search ads
RSA descriptions have room for a CTA. Use it. "Shop now," "Get a free quote," or "Order today" push clicks forward. Per Think with Google guidance on RSA creative, including a CTA in your description is a recommended best practice.
Use line breaks and formatting for readability
Shopping descriptions can use basic formatting. Break up dense text. Short paragraphs read faster than walls of words.
How Coinis AI Copywriting Speeds Up the Process
Generate product descriptions from your Brand Profile in seconds
Coinis AI Copywriting reads your Brand Profile and generates product descriptions built around your brand voice. Feed in a product URL and get multiple description options fast. No blank-page problem.
Maintain voice consistency across all ad formats
Your Shopping description and RSA copy should sound like they come from the same brand. Brand Profile keeps that consistent across every format you write.
Quickly iterate and test variations
Testing multiple descriptions is how you find what converts. AI Copywriting makes it fast to generate, compare, and swap without starting from scratch each time.
Or let Coinis do it.
From a product URL to a live Meta campaign. AI-generated creatives. On-brand copy. Direct publish to Facebook and Instagram. Real performance reporting. All in one platform.
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Frequently Asked Questions
How long should a Google Shopping product description be?
Google allows up to 5,000 characters, but recommends 500–1,000 for best results. Focus on specific product details in the first 160–500 characters, since that's where Google places the most weight when matching your product to search queries.
Can I include promotional text in a Google Shopping description?
No. Google prohibits promotional language such as discount percentages, 'free shipping,' or 'limited time offer' in Shopping descriptions. Stick to product-specific details like size, material, pattern, and key features.